fbsd-powerpc-low.c revision 206624
1/* FreeBSD/PowerPC specific low level interface, for the remote server for 2 GDB. 3 Copyright 1995, 1996, 1998, 1999, 2000, 2001, 2002 4 Free Software Foundation, Inc. 5 6 This file is part of GDB. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 2 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software 20 Foundation, Inc., 59 Temple Place - Suite 330, 21 Boston, MA 02111-1307, USA. */ 22 23#include <sys/cdefs.h> 24__FBSDID("$FreeBSD: head/gnu/usr.bin/gdb/gdbserver/fbsd-powerpc-low.c 206624 2010-04-14 20:31:06Z imp $"); 25 26#include "server.h" 27#include "fbsd-low.h" 28 29#include <sys/procfs.h> 30#include <sys/ptrace.h> 31 32#define ppc_num_regs 71 33 34/* Currently, don't check/send MQ. */ 35static int ppc_regmap[] = 36 { 0, 4, 8, 12, 16, 20, 24, 28, 37 32, 36, 40, 44, 48, 52, 56, 60, 38 64, 68, 72, 76, 80, 84, 88, 92, 39 96, 100, 104, 108, 112, 116, 120, 124, 40#if 0 41 /* 42 * XXX on FreeBSD the gdbserver for PowerPC was only tested with FPU-less 43 * cores i.e. e500. Let's leave the original FPR references around in case 44 * someone picks up and brings support for AIM-like FPU machines. 45 */ 46 PT_FPR0*4, PT_FPR0*4 + 8, PT_FPR0*4+16, PT_FPR0*4+24, 47 PT_FPR0*4+32, PT_FPR0*4+40, PT_FPR0*4+48, PT_FPR0*4+56, 48 PT_FPR0*4+64, PT_FPR0*4+72, PT_FPR0*4+80, PT_FPR0*4+88, 49 PT_FPR0*4+96, PT_FPR0*4+104, PT_FPR0*4+112, PT_FPR0*4+120, 50 PT_FPR0*4+128, PT_FPR0*4+136, PT_FPR0*4+144, PT_FPR0*4+152, 51 PT_FPR0*4+160, PT_FPR0*4+168, PT_FPR0*4+176, PT_FPR0*4+184, 52 PT_FPR0*4+192, PT_FPR0*4+200, PT_FPR0*4+208, PT_FPR0*4+216, 53 PT_FPR0*4+224, PT_FPR0*4+232, PT_FPR0*4+240, PT_FPR0*4+248, 54#endif 55 -1, -1, -1, -1, -1, -1, -1, -1, 56 -1, -1, -1, -1, -1, -1, -1, -1, 57 -1, -1, -1, -1, -1, -1, -1, -1, 58 -1, -1, -1, -1, -1, -1, -1, -1, 59 144, -1, 132, 128, 140, 136, -1 60 }; 61 62static int 63ppc_cannot_store_register (int regno) 64{ 65 /* Some kernels do not allow us to store fpscr. */ 66 if (regno == find_regno ("fpscr")) 67 return 2; 68 69 return 0; 70} 71 72static int 73ppc_cannot_fetch_register (int regno) 74{ 75 return 0; 76} 77 78static CORE_ADDR 79ppc_get_pc (void) 80{ 81 unsigned long pc; 82 83 collect_register_by_name ("pc", &pc); 84 return (CORE_ADDR) pc; 85} 86 87static void 88ppc_set_pc (CORE_ADDR pc) 89{ 90 unsigned long newpc = pc; 91 92 supply_register_by_name ("pc", &newpc); 93} 94 95/* Correct in either endianness. Note that this file is 96 for PowerPC only, not PowerPC64. 97 This instruction is "twge r2, r2", which GDB uses as a software 98 breakpoint. */ 99static const unsigned long ppc_breakpoint = 0x7d821008; 100#define ppc_breakpoint_len 4 101 102static int 103ppc_breakpoint_at (CORE_ADDR where) 104{ 105 unsigned long insn; 106 107 (*the_target->read_memory) (where, (char *) &insn, 4); 108 if (insn == ppc_breakpoint) 109 return 1; 110 /* If necessary, recognize more trap instructions here. GDB only uses the 111 one. */ 112 return 0; 113} 114 115static void 116ppc_fill_gregset (void *buf) 117{ 118 int i; 119 120 for (i = 0; i < ppc_num_regs; i++) 121 if (ppc_regmap[i] != -1) 122 collect_register (i, ((char *) buf) + ppc_regmap[i]); 123 124} 125 126static void 127ppc_store_gregset (const void *buf) 128{ 129 int i; 130 131 for (i = 0; i < ppc_num_regs; i++) 132 if (ppc_regmap[i] != -1) 133 supply_register (i, ((char *) buf) + ppc_regmap[i]); 134 135} 136 137struct regset_info target_regsets[] = { 138 { PT_GETREGS, PT_SETREGS, sizeof (struct reg), 139 GENERAL_REGS, 140 ppc_fill_gregset, ppc_store_gregset }, 141 { 0, 0, -1, -1, NULL, NULL } 142}; 143 144struct fbsd_target_ops the_low_target = { 145 ppc_num_regs, 146 ppc_regmap, 147 ppc_cannot_fetch_register, 148 ppc_cannot_store_register, 149 ppc_get_pc, 150 ppc_set_pc, 151 (const char *) &ppc_breakpoint, 152 ppc_breakpoint_len, 153 NULL, 154 0, 155 ppc_breakpoint_at, 156}; 157